/* 公共样式 */
.clearfix::before,
.clearfix::after {
  content: '';
  display: table;
  clear: both;
}
/* 去除a的下划线 */
a {
  text-decoration: none;
  color: #333;
}
body {
  font: 14px/1.5 Helvetica Neue, Helvetica, Arial, Microsoft Yahei, Hiragino Sans GB, Heiti SC, WenQuanYi Micro Hei, sans-serif;
  color: #333;
}
h2 {
  text-align: center;
  font-size: 60px;
  font-weight: bold;
}
.w {
  margin-top: 250px;
  margin-bottom: 100px;
  padding-left: 126px;
  padding-right: 126px;
}
/*顶部导航栏*/
.topbar-wrapper {
  width: 100%;
  height: 110px;
  line-height: 110px;
  background-color: #FFF;
  border-radius: 1%;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
  transition: 0.3s;
  /*设置为固定定位*/
  position: fixed;
  left: 0;
  top: 0;
  z-index: 99999;
  /* 左侧文字logo*/
  /* 右侧菜单*/
}
.topbar-wrapper .logo {
  margin-left: 125px;
  float: left;
}
.topbar-wrapper .logo h1 {
  font-size: 28px;
  font-weight: bold;
  color: #333;
}
.topbar-wrapper .right-menu {
  margin-right: 125px;
  float: right;
  margin-right: 70px;
}
.topbar-wrapper .right-menu li {
  overflow: hidden;
  position: relative;
  padding: 0 10px;
  text-align: center;
  font-size: 20px;
  font-weight: bold;
  float: left;
  margin-left: 25px;
}
.topbar-wrapper .right-menu li a {
  color: #555;
}
.topbar-wrapper .right-menu li p {
  position: absolute;
  width: 0;
  height: 4px;
  bottom: 25%;
  left: -20%;
  background-color: #bfa;
  border-radius: 50%;
  transition: 0.5s;
}
.topbar-wrapper .right-menu li:hover p {
  width: 140%;
  background-color: red;
}
.topbar-wrapper .right-menu .active {
  width: 140%;
  background-color: red;
}
.down {
  transform: translateX(-50%);
  left: 50%;
  width: 100px;
  height: 100px;
  position: absolute;
  background-size: 100%;
  background-image: url(../img/双箭头下.png);
  bottom: 180px;
  animation: down 1s  infinite alternate ;
}
.title {
  margin-top: 2%;
  padding-top: 2%;
  padding-left: 10vw;
  padding-bottom: 2%;
  background-color: skyblue;
}
.title h2 {
  text-align: left;
  font-size: 80px;
  color: #FFF;
}
@keyframes down {
  100% {
    bottom: 140px;
    opacity: 1;
  }
  0% {
    bottom: 80px;
    opacity: 0;
  }
}
.banquan {
  width: 100%;
  height: 200px;
  background-color: #252120;
  padding-top: 60px;
}
.banquan p {
  font-size: 24px;
  text-align: center;
  color: #FFF;
  margin-top: 20px;
}
.chilun {
  display: inline-block;
  width: 80px;
  height: 80px;
  background-image: url(../img/设置.png);
  background-size: cover;
  animation-name: example;
  animation-duration: 2s;
  animation-iteration-count: infinite;
}
@keyframes example {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}
